BFNA Title: Loeskypnum
Author: L. Hedenäs
Date: April 2008
Edit Level: R
Version: 3

Bryophyte Flora of North America, Provisional Publication

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Calliergonaceae-- Loeskypnum
Edit Level R

 

XX. LOESKYPNUM H. K. G. Paul, Bryol. Zeitschr. 1: 155. 1918 * [For Leopold Loeske, German botanist, 1865--1935, and Greek [h]ypnum, lichen, or by usage, pleurocarpous moss]

Lars Hedenäs

Plants medium-sized (rarely robust) and somewhat turgid, yellow-green, golden brown or coppery brown, often blackish proximally. Stem sparsely and irregularly branched, with central strand and without hyalodermis, cortex inner cells incrassate; outer pseudoparaphyllia broad, triangular; rhizoids or rhizoid initials at various points on the leaves, or on scattered points or in rows on the stem; axillary hairs with 1--5(--7) distal early brownish or yellow-brown cells. Stem leaves either straight, ovate, oblong or obovate and distally suddenly narrowed to rounded-apiculate apex, with apiculus often curved in over leaf, or falcate, ovate or broadly so, and gradually narrowed to acuminate or shortly acuminate apex, not plicate, strongly concave; margin entire or occasionally sinuous; costa single or occasionally branched in upper part, weak, ending 55--85% way up leaf; median lamina cells incrassate or strongly incrassate, porose; differentiated alar cells few, rectangular or shortly rectangular, incrassate, porose or indistinctly so, slightly inflated, in an approximately triangular, indistinctly delimited group, not or shortly decurrent. Sexual condition dioicous. Inner perichaetial leaves not plicate; vaginula naked or occasionally with one or two paraphyses. Capsule curved, horizontal, occasionally almost inclined; no separating annulusl; outside of exostome reticulate basally, margin dentate distally. Spores 13.5--21(--22.5) \um.

 

Species of Loeskypnum are usually easily recognized by the sparse branching of the shoots, the rather broad, apiculate or rather shortly acuminate, and strongly concave stem leaves, and the often golden brown or coppery brown color. Microscopic characters aiding in the identification are the strongly incrassate cells throughout the gametophyte, the weak and comparatively short costa, the few and only slightly inflated and differentiated alar cells, and axillary hairs early becoming brownish or yellow-brown. As pointed out in the notes after the family description, the species of this genus share several rhizoid, perichaetial, and sporophyte character states especially with the members of Calliergon, Straminergon, Warnstorfia, and, to some degree, Conardia. The species typically occur in intermediately mineral-rich and nutrient-poor fens, mostly relatively high in relation to the water table. Features separating Loeskypnum from Drepanocladus, Pseudocalliergon, or Sanionia are mentioned in the notes after the family description.

 

Species 2 (2 in the flora): northern Holarctic region.

 

SELECTED REFERENCES Hedenäs, L. 1993. A generic revision of the Warnstorfia-Calliergon group. J. Bryol. 17: 447--479. Janssens, J. A. 1983. Past and extant distribution of Drepanocladus in North America, with notes on the differentiation of fossil fragments. J. Hattori Bot. Lab. 54: 251--298. Miller, N. G. and Iwatsuki, Z. 1981. Loeskypnum wickesiae (Musci: Amblystegiaceae) in Alaska. Misc. Bryol. Lichenol. 9: 37--39. Wynne, F. E. 1944. Studies in Drepanocladus. IV. Taxonomy. Bryologist 47: 147--189.

 

1. Stem leaves falcate, erect-spreading to sub-imbricate, ovate or broadly ovate, gradually narrowed to an acuminate or shortly acuminate apex, not cucullate. . .  1. Loeskypnum badium

 

1. Stem leaves straight, ± imbricate, ovate, oblong or obovate, suddenly narrowed to a broadly acute to rounded, apiculate apex, often cucullate and with apiculus curved in over leaf . . . 2. Loeskypnum wickesiae

 

1. Loeskypnum badium (Hartman) H. K. G. Paul, Bryol. Zeitschr. 1: 155. 1918

 

Hypnum badium Hartman, Handb. Skand. Fl. ed. 5: 332. 1849; Drepanocladus badius ( Hartman) G. Roth

 

Plants medium-sized or rarely robust. Stem leaves erect-spreading to sub-imbricate, ± falcate, ovate or broadly ovate, above suddenly or gradually narrowed to acuminate or shortly acuminate apex, not cucullate.

 

Forest to low-alpine regions and the Arctic, intermediately mineral-rich to mineral-rich and usually nutrient-poor habitats, fens, irrigated rocks, mostly in relatively dry fen habitats, such as hummocks, rarely submerged; Greenland; Alta., B.C., Man., Nfld., N.W.T., Ont., Que., Yukon; Alaska; n Eurasia

 

The often golden brown or coppery brown color (often blackish in older parts), the normally weakly branched shoots and the strongly concave and the usually broad, falcate leaves with relatively shortly acuminate apices, make Loeskypnum badium easily recognizable even in the field. From L. wickesiaae it is separated by the more or less falcate, acuminate or shortly acuminate leaves.

 

2. Loeskypnum wickesiae (Grout) Tuomikoski, Ann. Bot. Fennici 10: 216. 1973

 

Calliergon wickesiae Grout, Moss Fl. N. Am. 1: 250, fig. 124 B. 1939

 

Plants medium-sized. Stem leaves ± imbricate, straight, ovate, oblong or obovate, distally suddenly narrowed to broadly acute to rounded, apiculate apex, often cucullate and with apiculus curved in over leaf.

 

Open intermediately mineral-rich, mostly relatively dry wetland habitats, in fens, usually in places with some seepage; Greenland; B.C., Nfld., Que.; Alaska, N.Y.; Asia (Japan, e Russia).

 

Loeskypnum wickesiae is similar to L. badium in its frequently golden brown or coppery brown color, normally sparsely branched shoots, and strongly concave leaves, but differs in its straight, acute or rounded, apiculate leaves. At first sight this species could perhaps be confused with Pseudocalliergon trifarium, but the latter usually grows in mineral-richer habitats, has less strongly concave, more broadly ovate leaves with a broadly rounded apex (no apiculus), lacks rhizoid initials in its leaves and has elongate-rectangular alar cells in larger groups than in L. wickesiae. Loeskypnum wickesiae could possibly also be confused with Straminergon stramineum, which, however, is pale or whitish green to yellow-green, has a rounded leaf apex without apiculus, and has inflated and hyaline (when old brownish), thin-walled or ± incrassate alar cells in well differentiated ovate or broadly ovate groups along the basal leaf margins.